Granted Patent
Utility
US 4,688,293 · App. 06/919,660
Vacuum cleaner
Inventor:
James E. McCambridge
Patented Case
View Patent ↗
Granted: Aug 25, 1987
Filed: Oct 16, 1986
Inventor
James E. McCambridge
Assignee (at issue)
Central Quality Industries, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.